Cavity Wall Insulation

[littlebearsmummy]

Thinking about getting cavity wall insulation. Any downsides to it that anyone knows of?

Condensation.
Walls 'breathe' and if you have double glazing (with no trickle vents) you are filing an air gap with something which can mean that the moisture in the air indoors has nowhere to go except to condense on a cold window. It may depend on how old your house is, and what matereial is being used for the insulation.
I expect there are wiser folk on here than me though!

cavity wall insulation will make your house more comfortable, and will cut your energy bills.

If you have a badly-built house and the builders have dropped bits of bick and mortar down the cavity, installers will be reluctant to fit it, as the bits of brick and mortar can cause damp penetration across the cavity once the airflow is stopped, and they will get the blame for the shoddy housebuilders.

If you have got water condensing on your walls, then you have got a damp problem, and you should (1) stop draping wet washing around the house and over radiators and (2) open the windows or trickle vents (trickle vents are just holes so not complicated). This applies regardless of cavity insulation.

People shouldn't ring me up and try and sell it me.
I have an old stone house, no cavities to fill